On September 01, 1992, Tuvalu Post released the local FDC which have attached with the WWF stamp series of Blue Coral. Image of Blue Coral shown in the left side and has a post mark of logo WWF.
Blue coral or Heliopora coerulea is a coral and as the only species in the family Helioporidae and the only Octocoral known to produce a massive skeleton that formed of aragonite. Individual polyps live in tubes within the skeleton and are connected by a thin layer of tissue over the outside of the skeleton.
It is a common member of shallow coral reefs and is found extensively throughout the Indo-Pacific including Ryukyu Islands in southwest Japan, Coral Sea in northeast Australia and American Samoa. The largest blue coral colony in the world is thought to be off of Ishigaki Island of the Yaeyama Islands, in southwest Japan. Due to its unusual blue colour and being fairly tolerant of conditions it can be used in tropical aquariums.
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